package test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import org.apache.commons.codec.binary.Base64;
public class AesEBC {

    /*已确认
    * 加密用的Key 可以用26个字母和数字组成
    * 此处使用AES-128-CBC加密模式，key需要为16位。
    */
    private static String sKey = "34c9bc8f41afaabf";
    private static String ivParameter = "8b7a547e0eb84b71";
    private static AesEBC instance = null;

    //private static
    private AesEBC() {

    }

    public static AesEBC getInstance() {
        if (instance == null)
            instance = new AesEBC();
        return instance;
    }

    // 加密
    public String encrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        byte[] raw = sKey.getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes(encodingFormat));
        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
        //return Base64.encodeBase64String(encrypted);
    }

    // 解密
    public String decrypt(String sSrc, String encodingFormat, String sKey, String ivParameter) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, encodingFormat);
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        // 需要加密的字串
        String cSrc = "123456";
        System.out.println("加密前的字串是：" + cSrc);
        // 加密
        String enString = AesEBC.getInstance().encrypt(cSrc, "utf-8", sKey, ivParameter);
        System.out.println("加密后的字串是：" + enString);
        System.out.println("yXVUkR45PFz0UfpbDB8/ew==".equals(enString));
        // 解密
        String DeString = AesEBC.getInstance().decrypt(enString, "utf-8", sKey, ivParameter);
        System.out.println("解密后的字串是：" + DeString);
    }

}
